code: def check_backward(self, x0_data, x1_data, y_grad):
      gradient_check.check_backward(
          functions.squared_error,
          (x0_data, x1_data),
          y_grad,
          eps=1e-2,
          **self.check_backward_options,
      )
  
file_path: chainer/tests/chainer_tests/functions_tests/loss_tests/test_discriminative_margin_based_clustering_loss.py
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 8 for calling the TestDiscriminativeMarginBasedClusteringLoss obj's underlying member method code with example usage: obj.check_backward(x0_data, x1_data, y_grad) without return types